Greener Journal of Physical Sciences

Greener Journal of  Physical Sciences  Vol. 3 (6), pp. 204-211, October 2013.  

ISSN: 2276-7851 © 2011 Greener Journals

Research Paper

Manuscript Number: 280913874

 

Effect of NaOH Concentration in Manufacture of Geopolymer Fly Ash Building Brick

 

*S.D. Muduli, J.K. Sadangi, B.D. Nayak, and B.K. Mishra

 

CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha.

 

*Corresponding Author’s Email: surabhidipali @ gmail. com

Abstract:

Geopolymerization is a non-fired process of chemical reaction between silica, alumina, calcium, magnesium, iron bearing constituents of the material under alkaline condition to form hydrous structures of rock forming silicate minerals. In this research work geopolymerization technology was used for utilization of industrial solid wastes like fly ash in manufacture of high strength building brick. In this process, sodium based alkaline activator (pH > 11.5) consisting of anions of Cl- and SO4˭ of different concentrations in presence of water had been used for reaction of silica and silicates to develop a stable and solidified geopolymer structure by curing below 20oC and also at normal atmospheric temperature of 35OC. The raw mix consisting of 87% of fly ash and alkaline activator had been used by maintaining Na2O/(Al2O3+SiO2) ratio of 0.025 to 0.078 to manufacture building materials ranging in crushing strength of 6 to 48 MPa.
 
Keywords: Alumino-silicate polycondensation; exothermic reaction process; mineral dissolution; silicon-oxygen tetrahedral.

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